Guess thats a 'no' Billy! Mine were OK surprisingly ( bearing in mind the state of everything else! ) I know the bits you mean and heaven knows what that actual coating is, as you say it makes the parts look plastic. Treat with care I'd say, If you have the coating off then your plater could advise. guess it depends on how bad they are. Second hand carbs often come up on the bay you may find some better ones?